Banks must face U.S. gold rigging lawsuit; UBS is dismissed

NEW YORK (Reuters) - A U.S. judge said gold investors may pursue much of their lawsuit accusing four major banks of conspiring for a decade to fix prices and exploit distortions at the expense of investors in global markets for the precious metal.

Antitrust and manipulation claims can move forward against Barclays Plc <BARC.L>, Bank of Nova Scotia ("ScotiaBank") <BNS.TO>, HSBC Holdings Plc <HSBA.L> and Societe Generale <SOGN.PA>, U.S. District Judge Valerie Caproni in Manhattan said in a decision made public on Tuesday.

Investors allege that the banks conspired from 2004 to 2013 to fix prices. They did not estimate the size of the banks' gold portfolios, but said the gold derivatives market alone was as large as $650 billion during the class period.

"From the gold plaintiffs' standpoint, it's a very substantial victory," Dan Brockett, a partner at Quinn Emanuel Urquhart & Sullivan representing the investors, said in a phone interview on Wednesday.

Investors have several lawsuits before the Manhattan court accusing banks of conspiring to rig rates and prices in financial and commodities markets.

In the gold case, investors said Barclays, Deutsche Bank, HSBC, ScotiaBank and Societe Generale conspired to manipulate prices of gold, gold futures and options, and gold derivatives through twice-a-day meetings to set the London Gold Fixing.

The investors said this conspiracy let the banks suppress prices and reduce risk at other investors' expense.

In her 73-page decision, Caproni said the investors plausibly alleged that the five banks recklessly created "artificial price dynamics" for gold, and that their misconduct was the "proximate cause" of the distortions.

She let the investors pursue antitrust claims for alleged unlawful restraint of trade from January 2006 to December 2012. The judge dismissed a claim for unjust enrichment.

Caproni gave the investors 14 days to amend their complaint.

The case is In re: Commodity Exchange Inc Gold Futures and Options Trading Litigation, U.S. District Court, Southern District of New York, No. 14-mc-02548.

(Reporting by Jonathan Stempel in New York; Editing by David Gregorio)